Exclusive: Monte dei Paschi CEO, former chairman under investigation - source

The chief executive of Monte dei Paschi di Siena , Fabrizio Viola, and the Italian bank's former chairman, Alessandro Profumo, are under investigation for alleged false accounting and market manipulation, a source with knowledge of the matter said. The investigation, which started in 2015 following complaints filed by small shareholders and consumer associations, comes as the Tuscan bank prepares to launch a 5 billion euro ($6 billion) stock sale after emerging as the weakest bank in Europe in i